Modifier Driver Fields

This article explains Modifier Driver fields in Model Reef.

You will learn:

• What modifier drivers are.

• When to use them instead of variables.

• How to apply them as multipliers or growth rates.

Modifier drivers do not represent standalone economic quantities. They are adjustment series used to shape other drivers and variables.

1

What is a modifier driver

Modifier drivers typically represent:

• Growth rates.

• Percentage uplifts or discounts.

• Seasonality indices.

• Scenario specific adjustment factors.

• FX or risk multipliers used purely as scalars.

They are almost always used inside formulas rather than reported directly.

2

Key fields for modifier drivers

When editing a modifier driver you will see fields such as:

• Name For example Growth - Revenue, Uplift - Promo, Index - Seasonality.

• Type Set to Modifier driver.

• Units Often percentages, indices or unitless multipliers.

• Time series grid Values per period representing the adjustment factor.

• Notes and tags To document what the modifier does and where it is used.

3

How modifier drivers are applied

In formulas, modifier drivers are used as scalars, for example:

• Adjusted revenue = Base revenue × Modifier driver

• Cost = Base cost × (1 + Inflation driver)

• Scenario B value = Base scenario value × Scenario modifier driver

They do not create P&L, Balance Sheet or Cashflow entries by themselves.

4

Scenario and branch specific modifiers

You can define modifier drivers that:

• Apply to the entire model in a scenario (for example a scenario wide discount factor).

• Apply only to a subset of variables via formulas.

• Are used to simulate shocks, discounts, price changes and other sensitivities.

Because each scenario is its own model, you can maintain different modifier profiles per scenario.

5

When to use a modifier driver instead of a variable

Use a modifier driver when:

• You want to tweak existing variable logic without duplicating variables.

• You need a reusable scalar series applied in many places.

• You want to centralise scenario specific multipliers for easy tuning.

Use a variable when the series itself should appear as a line item in financial statements.

Related articles

• Dropdown Field Behaviour

• Entering Seasonality

• Modifier Drivers

• Build a Sensitivity Analysis Pack